Aqueous ozone sanitizing system controller and methods

ABSTRACT

An illustrative control system for use with an aqueous ozone sanitizing device, for example, for sanitizing objects, including hands, hands and forearms, feet, other tissue, instruments, or other object sanitizing, including rinsing and clinical treatment. One embodiment of the control system includes a proximity sensor for detecting a user proximity to the sanitizing device, sensors for detecting a body part or object placement within a application zone, control of the delivery of desired aqueous ozone concentration and duration to the application zone, control of ozone off-gas mitigation, cycle error detection, and usage data logging, including personnel sanitizing practice compliance.

CROSS-REFERENCE TO RELATED APPLICATION

This is a nonprovisional patent application of U.S. Provisional Patent Application No. 63/056,299, filed Jul. 24, 2020, and titled Aqueous Ozone Sanitizing System; and U.S. Provisional Patent Application No. 63/056,538, filed Jul. 24, 2020, and titled Ozone Generator Cartridge for Ozonating Water; each of which are incorporated herein by reference.

BACKGROUND

The present invention relates to a system for sanitizing with aqueous ozone, and particularly, to the generation and delivery of aqueous ozone in sanitizing devices, including hand sanitizing devices.

Personal hygiene has long been an essential component of infection prevention, particularly hand hygiene. Subsequent to the implementation of soap as an initial hand hygiene solution, many modalities have been developed to maximize antimicrobial efficacy and improve hand hygiene compliance while minimizing skin irritation. However, there has been little regulation of these products until 2017, when the FDA issued a landmark ruling deeming 24 ingredients unsuitable for use in healthcare solutions. The ruling resulted in one solution, triclosan, being pulled from the market for its well-documented role in causing antimicrobial resistance, and deferred ruling on several others, calling for more safety and efficacy data.

Traditional soap, alcohol, chlorhexidine gluconate, povidone iodine, and benzalkonium chloride have all been widely used in healthcare as hand hygiene solutions, with differing levels of efficacy and risk. A review of literature discussing conclusions from many studies makes clear that there is conflicting evidence about the effectiveness of each product. Efficacy as an outcome variable can be assessed in many ways, making it difficult to compare and synthesize outcomes across studies. Researchers report different primary outcomes (colony-forming unit counts vs. infection rates) and use a variety of experimental designs (in vitro, in vivo, artificial contamination, observational, etc.). Additionally, efficacy often depends on the specific virus or bacterium, the length of time spent cleaning, and the cleaning technique (rubbing, scrubbing, etc.). Another factor that impacts efficacy is acquired self-resistance.

Although consensus about efficacy can be difficult, the collective evidence indicates that microbes can generate resistance to some hand hygiene solutions, and some of these solutions may even foster cross-resistance to other antibiotics. Additionally, skin damage or irritation from repeated use is a concern for many hand hygiene solutions. The limited existing evidence demonstrates a need for a future hand hygiene solution that is broadly effective against bacteria and viruses, while also avoiding both skin damage and bacterial resistance.

Ozone (O₃) is known to be a highly effective disinfectant. Ozone is produced when water (H₂O) or oxygen (O₂) is energized, producing monatomic (O₁) molecules that collide with oxygen (O₂) molecules to form ozone (O₃). The third oxygen atom in ozone is loosely bonded and is therefore highly reactive and readily attaches to and oxidizes other molecules. When used to sanitize, exposure to ozone has been demonstrated to be very effective at killing microorganisms, including bacteria, viruses, and spores.

Aqueous ozone, a solution of water (H₂O) and ozone (O₃), has also been demonstrated to be effective at sanitizing, i.e., killing microorganisms, when applied at a sufficient combination of ozone concentration and exposure time. Example applications for sanitizing using aqueous ozone include hand sanitizing in place of a soap or other disinfectant wash, the clinical treatment of infected tissue, sanitizing food, and sanitizing medical, food processing, and other instruments and work surfaces.

A concern noted regarding the use of ozone for hand and other tissue sanitizing is the potential adverse effect to human or animal cells if applied at too high of an ozone concentration or for an exposure that is too prolonged, e.g., the ‘dosage.’ It is known that very high doses of ozone can cause lung and other tissue damage. On the other hand, mild to moderate oxidative cell stress caused by low doses of ozone appears to be suggest a therapeutic effect that benefits and aids tissue healing. While it remains unclear how high a level of exposure would lead to unintended cellular damage or clinically relevant skin pathologies, safety warrants using only the ozone dosage required to achieve the desired logarithmic level of reduction of the targeted microorganisms, which is also expected to be also proven to be of little risk and likely therapeutic benefit to human tissue.

Many prior art systems provide aqueous ozone by generating ozone gas from air, which has lower concentrations of oxygen molecules than water, or from liquid oxygen, which is expensive and difficult to handle logistically and in the process. Further, once gaseous ozone is produced, it must be uniformly distributed and dissolve, which is difficult and inefficient, requiring a number of controlled process steps and often producing excess ozone off-gas and non-uniform distribution of dissolved ozone in the water stream. For the smaller scale of a device or other appliance, for example, for a single user, gaseous generation and mixing effective and efficient for an industrial or municipal scale is not practically applied from a cost, technological, or effectiveness perspective.

In light of the need for improved hand hygiene and other sanitizing solutions providing a well-regulated dosage, a high level of assurance must be incorporated into generating and delivering the desired level of aqueous ozone concentration level, complete area coverage, and the desired exposure time effective at killing targeted microorganisms while not inducing undue oxidative stress to the hands (dermis cells) or other tissues being sanitized.

The present disclosure is a result of the recognition of and response to this need for improved generation and delivery systems for aqueous ozone sanitizing, particularly for hand sanitizing.

SUMMARY

The present invention may comprise one or more of the features recited in the attached claims, and/or one or more of the following features and combinations thereof.

An illustrative control system for use with an aqueous ozone sanitizing device, for example, for sanitizing objects, including hands, hands and forearms, feet, other tissue, instruments, or other object sanitizing, including rinsing and clinical treatment. One embodiment of the control system includes a proximity sensor for detecting a user proximity to the sanitizing device, sensors for detecting a body part or object placement within a application zone, control of the delivery of desired aqueous ozone concentration and duration to the application zone, control of ozone off-gas mitigation, cycle error detection, and usage data logging, including personnel sanitizing practice compliance.

Embodiments according to the present disclosure advantageous produce aqueous ozone directly by electrolytic action within a water stream, thereby cost and process efficiently and effectively producing uniformly dissolved ozone in water (aqueous ozone) with minimal off-gassing. The embodiments further produce and deliver the aqueous ozone in a small compact space, minimizing ozone decay in application, and maximizing the rinsing and sanitizing effects of both chemical and mechanical action with a high surface area provided by small uniform particles of aqueous ozone with a high spin rate, applied by direct irrigation to the entire surface of the hands, efficiently loosening and lessening the microbe load.

While not limited to this application and concentration or kill rate, embodiments disclosed herein may be used to sanitize a user's hands with a 0.8 ppm concentration of aqueous ozone at a flowrate of about 3.0 gallons per minute for a duration of 7 seconds, which has demonstrated with the illustrative embodiment to have a antimicrobial effect of providing at least a minimum of a 3 log reduction in the broad spectrum of microorganisms that typical sanitization systems kill (for example, Tentative Final Monograph (TFM) 24), including for example, clostridioides difficile (C. diff). Additionally, embodiments disclosed herein can provide up to a 4.0 ppm concentration of aqueous ozone over different periods of time and different flowrates to meet the needs of various applications and uses. In some embodiments the sanitizer may be configured and used to operate as a wellness rinse without specific healthcare or medical disinfection performance criteria standards or approvals, and in other embodiments the sanitizer may be configured and used to operate as a medical device in a healthcare environment, including for example, for treatment and/or sterilization, with appropriate governmental and/or industry approvals and performance criteria standards, including, for example, with other body parts, tissue, or objects, including instruments.

In one illustrative embodiment, a control system for an aqueous ozone sanitizing device for sanitizing a first and a second object, comprises: a power supply; a controller powered by the power supply and for controlling a process of the sanitizing device, including a state of dispensing aqueous ozone to a first application zone; a proximity sensor coupled to the controller and configured to detect the presence of a user within a preset proximate distance to the sanitizing device; and a first object sensor coupled to the controller and configured to detect placement of the first object within the first application zone; and wherein the controller initiates the state of dispensing aqueous ozone to the first application zone only upon both the proximity sensor detecting the presence of a user within the preselected distance to the sanitizing device and the first object sensor detecting placement of the first object within the first application zone.

And additionally or alternatively, in any subcombination, the control system wherein the proximity sensor is a capacitive sensor configured to detect a user's body within a preselected distance from the sanitizing device that is close enough for the user to position the first object within the first application zone; wherein the proximity sensor is configured to detect that the user is within about 18 inches of the sanitizing device; wherein the proximity sensor is configured to detect that the user is within 12 inches of the sanitizing device; wherein the first object sensor is a time-of-flight sensor configured to detect the first object located within the first application zone.

An embodiment of the control system further comprising an indicator coupled to the controller, the indicator configured to provide to the user an indication of the state of the process; and additionally or alternatively, in any subcombination, wherein the indicator includes a plurality of different colored light illuminations, each of the plurality of different colored light illuminations indicating at least one of a plurality of states of the process, the plurality of states of the process including at least a ready state, the state of dispensing aqueous ozone to a first application zone, a state of process error, and a state of mitigating ozone of off-gas; wherein the indicator includes at least one light configured for a steady illumination for at least a first state of the process and a flashing illumination for at least a second state of the process; wherein the indicator is positioned with the sanitizing device to illuminate at least the first application zone with light; wherein the process of the sanitizing device further includes a state of mitigating ozone off-gas that the controller activates beginning no later than an initiation of the state of dispensing aqueous ozone to the first application zone and continuing after the termination of the state of dispensing aqueous ozone to the first application zone.

An embodiment of the control system further comprising a gaseous ozone detector coupled to the controller, and wherein the state of mitigating ozone off-gas is terminated by the controller after the gaseous ozone detector measures a level below a preset threshold; and additionally or alternatively, in any subcombination, wherein the state of mitigating ozone off-gas is terminated by the controller after a preset time delay following the termination of the state of dispensing aqueous ozone to the first application zone.

An embodiment of the control system further comprising: a second object sensor electrically coupled to the controller and configured to detect placement of the second object within a second application zone of the sanitizing device; and wherein the controller initiates the state of dispensing aqueous ozone to the first application zone only upon all of: the proximity sensor detecting the presence of a user within a preselected proximate distance to the sanitizing device; the first object sensor detecting placement of the first object within the first application zone; and the second object sensor detecting placement of the second object within the second application zone; wherein the first and second object detectors are configured to detect the user's placement of a left and a right hand within corresponding ones of the first and second application zones; wherein the first and second object detectors are configured to detect the user's placement and orientation of a left and a right hand within corresponding ones of the first and the second application zones; wherein the process further includes a state of process error, the process error state initiated by the controller upon detection of the first object displaced from the first application zone before a completion of the state of dispensing aqueous ozone to the first application zone.

An embodiment of the control system further comprising: at least one of a flow rate sensor and a parameter sensor, the parameter correlating to a level of ozone concentration within the aqueous ozone; and wherein the process further includes a state of process error, the process error state initiated by the controller upon detection of at least one of the flow rate sensor detecting a flow rate outside of a pre-selected range and the parameter sensor detecting the parameter outside of a pre-selected range.

An alternative embodiment of a control system for an aqueous ozone sanitizing device for sanitizing an object, comprises: a controller for controlling a process of the sanitizing device, including a plurality of process states; a proximity sensor coupled to the controller and configured to detect the presence of a user within a preset proximate distance to the sanitizing device; an object sensor coupled to the controller and configured to detect placement of the object within an application zone of the sanitizing device; and a user interface coupled to the controller and including an indicator of the plurality of process states; and wherein plurality of process states include at least: a state of dispensing aqueous ozone to the application zone initiated by the controller only upon both the proximity sensor detecting the presence of a user proximate to the system and the object sensor detecting placement of the object within the application zone; a state of completion initiated by the controller upon maintaining the state of dispensing aqueous ozone to the object in the application zone for a preset length of time; and a state of process error initiated by the controller upon not maintaining a state of dispensing aqueous ozone to the object in the application zone for the preset length of time.

An alternative embodiment of a control system for an aqueous ozone sanitizing device for sanitizing a user's body parts, comprising: a controller for controlling a process of the sanitizing device, including a plurality of process states; a plurality of body part sensors coupled to the controller and configured to detect placement of the user's body parts within at least one application zone of the sanitizing device; and a user interface coupled to the controller and including an indicator of the plurality of process states; and wherein plurality of process states of the controller include at least: a ready state; a state of dispensing aqueous ozone to the at least one application zone initiated by the controller upon the plurality of body part sensors detecting placement of the user's body parts within the at least one application zone; a state of completion initiated by the controller upon maintaining the state of dispensing aqueous ozone to the user's body parts within the at least one application zone for at least a preset length of time; a state of process error initiated by the controller upon not maintaining a state of dispensing aqueous ozone to the user's body parts within the at least one application zone for the preset length of time; and a state of mitigating ozone off-gas initiated by the controller to coincide with the initiation of and continuing after termination of the state of dispensing aqueous ozone; and wherein the indicator includes a plurality of different light illuminations, each of the plurality of different light illuminations indicating at least one of the plurality of process states. Additionally or alternatively, wherein the user interface further indicates proper orientation of the user's body parts within the at least one application zone.

For purposes of this disclosure, including the claims, the term ‘about’ is defined as within a definite range of +/−10% of the referenced value. Additional features of the disclosure will become apparent to those skilled in the art upon consideration of the following detailed description of the illustrative embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS

The detailed description particularly refers to the accompanying Figs. in which:

FIG. 1A is a perspective assembly view of a first illustrative embodiment of an aqueous ozone sanitizing system according to the present disclosure;

FIG. 1B is a perspective assembly view of a second illustrative embodiment of an aqueous ozone sanitizing system according to the present disclosure;

FIG. 2 is a user point of view of the illustrative embodiments of FIGS. 1A and 1B;

FIG. 3A is front perspective view the aqueous ozone sanitizing system of FIG. 1A;

FIG. 3B is rear perspective view the aqueous ozone sanitizing system of FIG. 1A;

FIG. 4 is an electrical and fluid schematic block diagram of an illustrative embodiment of an aqueous ozone sanitizing system according to the present disclosure;

FIG. 5 is a partial perspective assembly view of the aqueous ozone sanitizing system of FIG. 1A;

FIG. 6A is an exploded perspective view of a hood portion of the aqueous ozone sanitizing system of FIG. 1A;

FIG. 6B is an exploded perspective view of a hood portion and lower frame portion of the aqueous ozone sanitizing system of FIG. 1A;

FIG. 6C is a front view of a front hood cover portion illustrating the hand openings of the aqueous ozone sanitizing system of FIG. 1A;

FIG. 7A is a front view illustrating the aqueous ozone spray patterns of a first illustrative embodiment of an aqueous ozone sanitizing system according to the present disclosure;

FIG. 7B is a left side view illustrating the aqueous ozone spray patterns of the illustrative embodiment shown in FIG. 7A;

FIG. 7C is a front view illustrating the aqueous ozone spray patterns of a second illustrative embodiment of an aqueous ozone sanitizing system according to the present disclosure;

FIG. 8 is a cross-sectional perspective assembly view showing the spray chamber portion of the illustrative embodiment of the aqueous ozone sanitizing system of FIGS. 3A and 3B taken along cutting plane line 8-8 shown in FIG. 3B;

FIG. 9A is a cross-sectional perspective view showing the upper portion of the spray chamber of the illustrative embodiment of the aqueous ozone sanitizing system of FIGS. 3A and 3B taken along cutting plane line 9A-9A shown in FIG. 3B;

FIG. 9B is a cross-sectional perspective view showing the lower portion of the spray chamber of the illustrative embodiment of the aqueous ozone sanitizing system of FIGS. 3A and 3B taken along cutting plane line 9B-9B shown in FIG. 3B;

FIG. 10A is a cross-sectional bottom view showing the upper portion of the spray chamber of the illustrative embodiment of the aqueous ozone sanitizing system of FIGS. 3A and 3B taken along cutting plane line 9A-9A shown in FIG. 3B;

FIG. 10B is a cross-sectional top view showing the lower portion of the spray chamber of the illustrative embodiment of the aqueous ozone sanitizing system of FIGS. 3A and 3B taken along cutting plane line 9B-9B shown in FIG. 3B;

FIGS. 11A and 12A illustrate spray zones and spray devices in a front view of a spray chamber portion of an illustrative embodiment of an aqueous ozone sanitizing system according to the present disclosure;

FIGS. 11B and 12B illustrate spray zones and spray devices in a right side view of a spray chamber of the illustrative embodiment of FIGS. 11A and 12A;

FIGS. 11C and 12C illustrate spray zones and spray devices in a rear view of a spray chamber of the illustrative embodiment of FIGS. 11A and 12A;

FIG. 13 illustrates plugging and unplugging of an aqueous ozone generator of the illustrative embodiment with a docking station of the aqueous ozone sanitizing device of FIGS. 1A and 1B;

FIG. 14A illustrates a docking receptacle portion of an illustrative embodiment of an aqueous ozone sanitizing device with a locking mechanism for the aqueous ozone generator according to the present disclosure;

FIG. 14B illustrates an illustrative embodiment of the aqueous ozone generator with a locking mechanism for engaging the docking receptacle according to the present disclosure;

FIG. 15 illustrates an exploded view of the aqueous ozone generator of FIG. 13;

FIG. 16 illustrates a cross-sectional view of a manifold portion of the aqueous ozone generator of FIG. 15 taken along cutting plane line 16-16 shown in FIG. 15;

FIG. 17 illustrates an electrical schematic block diagram of an illustrative embodiment of an aqueous ozone sanitizing system according to the present disclosure; and

FIG. 18 shows an illustrative process for the operation of the illustrative embodiments of FIGS. 1A-B, 4, and 17.

DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENTS

For the purposes of promoting and understanding the principals of the invention, reference will now be made to one or more illustrative embodiments shown in the drawings and specific language will be used to describe the same.

Overview

Referring to FIG. 1A, a first illustrative aqueous ozone sanitizing system for tissue sanitizing, forms a wall mounted hand sanitizer 300 a suitable for general commercial or healthcare facility use. A second embodiment forms a counter mount hand sanitizer 300 b for like usage, but rather than including lower portion 334 a for wall mounting, the counter mount hand sanitizer is configured to provide or mount to an existing countertop 334 b or similar horizontal support surface. Referring to FIGS. 2, 3A and 5, the embodiments include a hooded sanitizing chamber 310 defining openings 372 a-b for hands 20, spray devices 410 and 430, a docketing receptacle 350 for pluggably receiving a replaceable ozone generator 100, and a controller 512 and hand sensors 590 for sensing hand position and orientation, for delivering a desired ozone concentration and duration, and for tracking usage, including personnel sanitizing practice compliance.

While the illustrative embodiment discusses sanitizing of a user's hands, other embodiments within the scope of the claimed invention include sanitizing systems suitable for sanitizing other body parts, for example, hands and forearms or feet, and for sanitizing other objects, for example, including tools or instruments such as medical devices, so it is under stood that an object or a different body part or tissue can be substituted for all occurrences of the disclosure reciting ‘a hand.’

The ozone generator 100 (FIG. 15) used with the hand sanitizer 300 may included more than one ozone generation cells 210 a-d. Additionally, quality sensors, for example, including but not limited to sensor determining aqueous ozone concentration, for example oxidation-reduction potential sensors 230 and 240 a-b, may optionally be housed within the replaceable ozone generator 100, for example, an untreated water inlet sensor 230 the measurement of which can be used to compare with the measurement of a single or redundant ozonated water outlet sensors 240 a-b for controller 512 to determine and control the ozone concentration provided by the generator 100 to a desired level. Sensors may also be included in ozone generator 100 and/or sanitizer 300 that provide measurement of other properties and parameters of water, aqueous ozone, and the components of system 300 include generator 100 discussed here.

Referring to FIG. 2, the front cover 370 defines a left opening 372 a is configured to guide a left hand 20 a to a proper position and orientation for a left spray zone (also referred to as an application zone) within the spray chamber 310 and a right opening 372 b guides a right hand 20 b to a proper position and orientation for a right spray zone within the spray chamber 310, both zones ensuring full coverage of hands 20 with the direct spray of ozonated water 52. The user interface 584 may include fixed markings or markings animated by the controller 512, presence sensor 582, and/or hand sensors 590 to further guide timing of insertion, withdrawal, and the position and orientation of the hands 20. The front cover 370 may further define additional features for guidance of hands 20 as will be discussed further below.

Referring to FIGS. 3A and 3B, the hand sanitizer 300 includes a hooded sanitizing chamber 310 and a lower portion 334. The hooding prevents undesirable escape of ozonated water 52 and off-gassed ozone from the chamber 310, and includes covers 336. A top cover 344 includes a fan screen 346 through which air pulled from the chamber 310 and then filtered free of ozone is exhausted. A cover frame 338 includes accessible or removable right cover 342 and left cover 340.

The applicant has found it advantageous to maintaining ozone concentration provided by aqueous ozone generators 100 a-b to locate the generators in close proximity to the sanitizing chamber. For example, in at least one embodiment less than a 30% loss of ozone concentration was noted between the aqueous ozone generators 100 a-b and the spray chamber 310, therefore, minimizing losses, and controlling the ozone production to account for losses is required.

Opening the covers 340 and 342 provides access to docking receptacle 350 a-b in which aqueous ozone generators 100 a-b are plugged and are unplugged from and swapped when exhausted, as will be discussed further below. The docking receptacles 350 a and 350 b provide various water and/or electrical connections to connect the generators 100 a-b with other portions of the hand sanitizer as is further described below. Docking receptacles 350 a-b are each defined by the housing chassis 330 between each of the left side 326 and right side 328 of the sanitizing chamber 310 and the respective left cover 340 and right cover 342. Some embodiments may include one and some other embodiments more than two docketing receptacles 350 a-b to support a different number of simultaneously operated or reserve generators 100 a-b.

A control system 500 of the hand sanitizer 300 may include a presence sensor 582 for detection of a user, the function of which will be further described below. The presence sensor 582 may be located with the front cover 370, the adjacent frame 338 above or below the cover, the top cover 344, or the lower portion 334.

The sanitizing chamber 310 and associated cover frame 338 may be coupled to a housing chassis 330, also shown in FIGS. 6A and 6B. The lower frame 332 may be used to attach the hand sanitizer 300 to a wall or other fixed or movable structure, and may also support the chassis 330. Advantageously, the illustrative embodiment of hand sanitizers 300 a-b have a sanitizing chamber 310 and cover 336 spanning only about 17.4 inches in height, about 20.5 inches in width, and about 18.6 inches in depth. The lower portion 334 included with sanitizer 300 a adds about 19.6 inches in height below the cover 336. The compact size of the hand sanitizers 300 a-b is advantageous to the small spaces in commercial or healthcare facilities available for the installation, including as a replacement to traditional handwashing sinks and other sanitizing stations.

Referring to FIGS. 5 and 6B, the lower frame 332 may house portions of the control system 500 and a water supply system 600, including, for example, a power supply 510, an untreated water holding tank 614, a water pump 622, a water filter, and connections to an untreated water supply 50. Other portions of the control system 500 and water supply system 600 may be located between the chamber 310 and the cover frame 338 and associated covers. For example, the controller 512 and associated ozone generator circuits 40, which may be separate from or integral with the controller, may be located between a chamber top 314 and the top cover 344. Additionally, an ozone filter 348 and a fan 560 may be located between the chamber top 314 and the fan screen 346.

As illustrated in various cross-sectional views FIGS. 8 and 9A through 10B, A spray system 400 associated with and the sanitizing chamber 310 includes spray devices 410 a-e and 440 a-e which receive ozonated water 52 from the generators 100 a-b and may also include distribution manifolds 402 a-b (FIG. 4). The spray devices 410 and 440 are distributed within the sanitizing chamber 310, for example, within a chamber upper half 312, for example, with a chamber top 314, and within a chamber lower half 320, for example, with a chamber bottom 322. The chamber top 314 may include contours 316 that can provide mounting locations for the desired position and/or orientation of the spray devices 410 a-c and 430 d-e as will be discussed further below. Similarly, the chamber bottom 322 a may include contours 324 for spray devices 410 d-e and 430 d-e. A drain 325 provides an escape path for the spent ozonated water 52 delivered by the spray devices 410 a-e and 430 a-e, for example, defined through a portion of the chamber bottom 322.

Hood/Chamber Opening

While prior art system are directed to devices that require the rubbing of hands under a unitary stream of aqueous ozone, or hold hands horizontal, palms down as they are sprayed by an oscillating spray bar, at least one of the illustrative embodiments herein uses the increased efficiency and effectiveness offered by position hands so that palms are vertical, facing each other. This position of the hands provides a system 300 having more compact chamber 310, spray zones 420 and 440, reduced distance from aqueous ozone generators 100 to spray zones 420 and 440, an easier position to hold hands in for the user, reduced splashing of water and off-gassed ozone outside of the chamber 310, and longer run-off paths for additional chemical and mechanical action by the aqueous ozone.

Referring to FIG. 6C, each opening 372 a-b of the front cover 370 defines an oblong shape, for example, a stadium as shown in the illustrative embodiment, or an oval, ellipse, or rectangle. The major axis 376 a and 376 b is oriented perpendicular relative to the floor or ground plane, thereby instructing a vertical orientation for each hand 20 for insertion through the opening, i.e. the palm 34 is oriented perpendicular or closer to perpendicular than horizontal relative to the floor as illustrated in FIG. 2, making it easier to insert each hand while clearing the rim of the opening. The major axes 376 a-b of each opening 372 a-b defines an opening vertical span 382 from edge to edge of about 8.4 inches and a minor axis 374 defines an opening horizontal span 384 of each opening from edge to edge of about 5.8 inches, providing a ratio of the horizontal span to the vertical span of less than 3:4, additionally or alternatively, about 2:3, and additionally or alternatively, less than 2:3. The distance between centers 380 of the two openings for the illustrative embodiment is about 5.3 inches. These ratios have been discovered to provide visual cues to the user to orient their hands in a palm-to-palm orientation to ensure complete coverage from the ozonated water spray for most efficient sanitization. They also have been discovered to enable minimizing the written or other instructions required by increasing the obviousness of the use and interaction with the sanitizer 300.

In the illustrative embodiment of the sanitizer 300, a channel 390 portion of the area of the between the two openings 372 a-b is also opened, thereby connecting the two openings, but retaining enough of the oblong shape of each individual opening 372 a-b to retain the overall appearance of a vertical orientation of each opening, thereby retaining the feature instructing a vertical orientation for each hand 20 for insertion through the openings. For example, in the illustrative embodiment, the narrowest vertical span 392 of the channel 390 connecting the two openings 372 a-b spans about 5.4 inches, providing a ratio of the opening vertical span (major axis) 382 of each individual opening (8.4 inches) to the vertical span 392 of the connecting channel of less than 3:4, additionally or alternatively, a ratio of about 2:3, and additionally or alternatively, a ratio of less than 2:3.

Defining an open but narrowed channel 390 between the pair of openings 372 a-b also provides an advantages to the user of having better visibility of both hands 20 when inserted through the openings and into the chamber 310, retaining the advantage of the channel between the pair of openings be a smaller vertical span than the openings so as to limit the escape of aqueous ozone or ozone off-gas, and guiding the left and right hands 20 to the center 380 of each opening 372 a-b. Such advantages are advantageous over prior art openings forming a single horizontal elongate opening of uniform vertical height.

The space between the opening 372 a-b that forms the channel 390 is less than 1 inches wide along a horizontal axis 374, thereby the connected pair of openings and channel forming an open horizontal span of about 12 inches. A perimeter formed by the openings 372 a-b and channel 390 may include a rim 394 to frame the opening, enhancing one or more of the visual contrast, material properties, or hand edge protection. For example, the rim 394 may be formed from liquid silicone rubber (LSR) or a thermoplastic elastomer (TPE). The front cover 370 may be formed from polyphenylene sulfide (PPS), polyvinylchloride (PVC) and may optionally be translucent or transparent.

The front cover 370 and/or rim 390 may include formed or applied features such as markings 396 and 398 that further guide the position and orientation of the hands as they are inserted through the openings 372 a-b and into a static position and orientation within the sanitizing chamber 310. For example, features 398 can provide a vertical position and/or rotational orientation of the hands 20 and features 396 can provide a horizontal position and/or rotational orientation of the hands 20.

The sanitizing chamber 310 and other components in contact with the ozonated water 52 may be constructed from materials resistant to degradation from aqueous ozone, for example, molded from polyphenylene sulfide (PPS). Other portions of the cover 336, frame 338, and lower portion 334 can be constructed from durable materials such as polybutylene terephthalate (PBT), aluminum, stainless steel, and powder-coated steel.

Spray System

At least one prior art device for aqueous ozone hand sanitizing teaches proper sanitization requires hand washing movement, e.g. rubbing or scrubbing of hands together, throughout the aqueous ozone wash cycle. A prior art device also teaches hands held static during the aqueous ozone wash cycle with spray devices located above and below hands orientated horizontally, i.e. palm 34 and dorsal sides 36 parallel to the floor.

In contrast, it has been discovered by the applicant of the instant disclosure that it is advantageous for static hand sanitizing to orient the hands 20 vertically, i.e. thumbs 40 superior (at top) and palms 34 facing each other, in order to achieve a reduction in size of the aqueous ozone hand sanitizer 300, particularly the size of the sanitizing chamber 310 and associated spray system 400, and to minimize the number of spray heads 410 and 430 and maximize the coverage of all regions of the hand 20 with ozonated water 52 with streams directly from the spray devices, i.e., direct irrigation rather than coverage from run-off.

In one embodiment as illustrated in FIG. 7C, it has also been discovered to be advantageous to rotate the hands 20 slightly angled apart, e.g., rotating the forearms 44 along the proximal-distal axis 26 (FIG. 7B) to position the thumbs 40 laterally further apart such that the surface plane of the palm 34 and dorsal sides 36 of each hand are about 115 degrees relative to the floor, thus angling the palms of the hands each to an anterior-posterior rotation 25 of about 25 degrees. This provides about 50 degrees of angular separation between the palms 34, thereby reducing the opposing hand's obstruction of spray line of sight from the spray devices 410 and 430 to each palm, thus improving the facing palms' direct line of spray exposure to the spray devices.

It has also been discovered to be advantageous to spread the fingers 38 and thumb 40 apart from each other for static hand sanitizing, thereby further reducing obstructions to direct line of spray exposure from the spray devices 410 and 430 to all areas of the fingers and thumb.

It has also been discovered to be advantageous to achieving the above disclosed goals to provide spray devices 410 and 430 oriented relative to and directed to specific regions of each hand 20. TABLE 1, listed below, and the discussion that immediately follows is directed to describing an illustrative arrangement of the spray devices 40 and the hands 20, particularly the coverage of the hands 20 by each spray device 410 and 430.

TABLE 1 Spray Device Hand Coverage/Relative Origin Medial Posterior Proximal/ Distal/ Spray Lateral (toward Anterior (dorsal/ Wrist Central Fingers Device (toward little (palm back (carpus (metacarpal (phalangeal 410/430 thumb) finger) side) side) region) region) region) a X X X X b X X X X X c X X X d X X X X X e X X X X X

Referring to FIGS. 7A and 7B, an illustrative spray system 400 is shown providing sanitizing of a user's hands 20 with ozonated water 52, illustrated as spray patterns 421. Advantageously, elements of the control system 500 can guide the position and/or orientation of the hands 20 into a bounded area defined within the spray chamber 310, referred herein as a spray zones 420 and 430. In the illustrative embodiment, the position, orientation, and overlapping spray patterns 421 define the spray zones 420 and 430 as bounded areas within which the hands 20 are position to maximize the irrigation coverage of the hands with direct spray of ozonated water 52. The distance from the spray devices 410 and 430 to the spray zones 420 and 430, and thus to the hands 20, is also selected to provide full coverage while minimizing losses in ozone concentration, thus providing simultaneous irrigation coverage of the hands, thereby eliminating the necessity of moving or scrubbing the hands and minimizing the time of irrigation required for sanitizing the hands.

Referring to FIG. 7B, the user's hand 20 includes a proximal wrist 30, also know as a corpus region, a central region 32, also known as a metacarpal region, and distal fingers 38, also known as a phalangeal region. For select embodiments, a portion of the forearms 44 may be included in the scope of the term wrists 30, and therefore hands 20. The user's hands 20 also did defines a lateral thumb side 40 and a medial side 42, i.e., an opposite side adjacent the little finger. Referring to FIG. 7A, the user's hands further define palms 34, i.e., an anterior side, and a dorsal side 36, i.e., a posterior or backside.

As illustrated by both Table 1 and FIGS. 7A and 7B, specific ones of the spray devices 410 and 430 are directed to specific regions of the hands 20. In the illustrative embodiment, spray devices 410 and 430 may each include a fluidic oscillator 411 (not shown) that provides a two-dimensional fluid oscillation centered on a longitudinal axis 412 of the device. In the illustrative embodiment, the fluidic oscillator 411 or other features controlling the spray exiting the spray devices 410 and 430 provide an three-dimensional spray pattern, including an angular spray fan 419 a of about 32 degrees about a anterior-posterior 418, and an angular spray fan 419 b of about 16 degrees about a proximal-distal axis 435 a. Illustrative spray devices 410 and 430 are, for example, available from Bowles Fluidics Corporation of Columbia, Md. Use of such fluidic oscillators positioned and oriented as disclosed effectively achieves the desired combined chemical and mechanical action applied aqueous ozone with the high surface area provided by small uniform particles with a high spin rate, applied by direct irrigation to the entire surface of the hands, efficiently loosening and lessening the microbe load; however, other forms of application of aqueous ozone may be used if similar dispensing of aqueous ozone is achieved.

In the illustrative embodiment, and as shown in FIGS. 7A-B and FIGS. 9A-10B, the spray devices 410 a-c and 430 a-c are located in a chamber upper half 312, for example, coupled to chamber top 314, and the spray devices 410 d-e and 430 d-e are located in a chamber lower half 320, for example, coupled to chamber bottom 322. Additionally, the spray devices 410 a/430 a, 410 a/430 d, and 410 a/430 e are located anterior to, e.g., in-between, the hands 20, and the spray devices 410 b/430 b and 410 c/430 c are located posteriorly, e.g. outside of, the hands 20. As can be noted for the spray devices 410 b and 430 b, selected spray devices may also have the longitudinal axis 412 a aligned with, or about aligned with, the lateral-medial axis 22 of the hands 20. This alignment depends on the desired relative position and anterior-posterior rotation 25, for example as shown in FIG. 7A with palms facing and parallel and contrasted with FIG. 7C with palms slightly angled apart at the top, that the control system 500 guides the user's hands to.

The combination of the location and rotational position of the spray devices 410 and 430 and the position and rotational orientation of the hands 20 to which they are guided by the control system 500 of the illustrative embodiment is shown in FIGS. 7A and 7B (and alternatively FIGS. 7C and 7B) and FIGS. 11A-12C and is further described below. The spray devices 410 a-b/430 a-b have a direct spray line of sight with the palms 34, the spray devices 410 c/430 c has a direct spray line of sight with the dorsal side 36, and the spray devices 410 d-e/430 d-e have direct spray line of sight to the medial 42 and portions of the palm 34 and dorsal side 36.

As illustrated in the Figs. and described in Table 1, the spray devices 410 a/430 a are directed to the wrist 30 and may also be directed to one or both of the forearm 44 and the central region 32. The spray devices 410 b/430 b are directed to the central region 32 and may also be directed to at least a portion of the fingers 38. The spray devices 410 c/430 c are directed to the fingers 38 and may also be directed to a portion of the central region 32. The spray devices 410 e/430 e are directed to the fingers 38, and may also be directed to a portion of the central region 32. The spray devices 410 d/430 d are directed to the wrist 30 and at least a portion of the central region 32, and may also be directed to a portion of the forearm 44.

Because the coverage of the hands 20 with direct spray from the spray devices 410 and 430 is more consistent than is subsequent runoff of ozonated water 52, and because ozone concentration is reduced by mechanical action, the illustrative embodiment maximizes the direct spray coverage of the hands 20.

To further facilitate full coverage with the ozonated water 52, elements of the control system 500, including the user interface 584 and optionally the hand sensors 590, may also guide the user to separate the fingers 38 and thumb 40, for example, as is illustrated in FIG. 7B, or to a higher degree of separation than is illustrated.

The following description along with FIGS. 11A-12C disclose specific features of the illustrative embodiment of the spray system 400 to achieve the above discussed aspects of spray coverage. A device anterior-posterior datum plane 431 is located centrally in the spray system 400 and the sanitizing chamber 310. A device proximal-distal location datum plane 433 a is located at a proximal (front) edge of the spray system 400. A device lateral-medial datum plane 435 a is located at a proximal, bottom (medial) edge of the spray system 400 and the spray chamber 310, for example, about 34 inches above the floor level.

A spray zone proximal-distal datum plane 433 b is located at a proximal (front) edge of the spray chamber 310. A spray zone lateral-medial datum plane 435 b is located centrally in the spray chamber 310, for example, aligned with a center of the openings 372 a-b and sloped downward, for example, about 4 inches above the bottom edge of the spray system 400 and the spray chamber 310, and sloped downward about 15 degrees into spray chamber.

The spray devices 410 a-c/430 a-c are located in the chamber upper half 312 and have an angular displacement 414 a about a proximal-distal axis 417 that spans within a range of 30 to 50 degrees, for example, about 45 degrees, and an angular displacement 416 a about a anterior-posterior axis 418 that spans within a range of 30 to 50 degrees, for example, about 40 degrees. The spray devices 410 d-e/430 d-e are located in the chamber lower half 320 and have an angular displacement 414 b about the proximal-distal axis 417 that spans within a range of 0 to 10 degrees, for example, about 3 degrees, and an angular displacement 416 b about the anterior-posterior axis 418 that spans within the range of 0 to 10 degrees, for example, about 4 degrees.

Referring now to FIGS. 12A-12C, a left spray zone 420 defined within the sanitizing chamber 310 specifies the area within which the left hand 20 a is positioned and oriented by the control system 500, and a right spray zone 440 specifies the area within which the right hand 20 b is positioned and oriented by the control system. In the illustrative embodiment, each of the left and right spray zones 420 and 440 encompass less than about 320 cubic inches.

Each of the left and right spray zones 420 and 440 define a proximal-distal axis 417 having a zone anterior-posterior slope 444 of about 15 degrees about the anterior-posterior axis 418, sloping downwardly in a direction extending from the pair of openings 372 a-b and into the sanitizing chamber 310.

Each of the left and right spray zones 420 and 440 define a lateral-medial axis 424 that is oriented a zone lateral-medial slope 447 of between about 10 degrees and about 25 degrees about the anterior-posterior axis 418 and is sloped outwardly in a direction extending from the bottom toward the top of the pair of openings 372 a-b.

Each of the left and right spray zones 420 and 440 define an anterior zone edge 442 of about 0.5 inches from the center of the openings 372 a-b, a proximal zone edge 446 of about 4 inches from the openings, a lateral-medial zone center 441 of about 4 inches above the bottom edge of the spray system 400 and the spray chamber 310.

Each of the left and right spray zones 420 and 440 can define along an anterior-posterior axis 418 a lateral zone anterior-posterior span 443 a of about 3.5 inches and a medial zone anterior-posterior span 443 b of about 4.5 inches, define along an lateral-medial axis 424 a zone lateral-medial span 447 of about 8 inches, and define along a proximal-distal axis 417 a zone proximal-distal span 449 of about 10 inches.

In the illustrative embodiment of spray system 400, the spray device 430 a has an anterior-posterior location 432 a of about 1.1 inches, a proximal-distal location 434 a of about 6.2 inches, and a lateral-medial location 436 a of about 8.3 inches. The spray device 430 b has an anterior-posterior location 432 b of about 4.5 inches, a proximal-distal location 434 b of about 11.0 inches, and a lateral-medial location 436 b of about 9.7 inches. The spray device 430 c has an anterior-posterior location 432 c of about 6.6 inches, a proximal-distal location 434 c of about 15.2 inches, and a lateral-medial location 436 c of about 8.0 inches. The spray device 430 d has an anterior-posterior location 432 d of about 0.8 inches, a proximal-distal location 434 d of about 4.2 inches, and a lateral-medial location 436 d of about −3.1 inches. The spray device 430 e has an anterior-posterior location 432 e of about 1.1 inches, a proximal-distal location 434 e of about 6.9 inches, and a lateral-medial location 436 e of about −4.1 inches. The spray devices 410 a-e have corresponding mirror image locations to those of spray devices 430 a-e.

The spray device 430 a has a rotational location 413 a of about −18 degrees about the proximal-distal axis 417 and relative to the anterior-posterior datum plane 431, and a rotational location 415 a of about 41 degrees about the anterior-posterior axis 418 and relative to the proximal-distal datum plane 435 b. The spray device 430 b has a rotational location 413 b of about 11 degrees about the proximal-distal axis 417 and relative to the anterior-posterior datum plane 431, and a rotational location 415 b of about 68 degrees about the anterior-posterior axis 418 and relative to the proximal-distal datum plane 435 b. The spray device 430 c has a rotational location 413 of about 26 degrees about the proximal-distal axis 417 and relative to the anterior-posterior datum plane 431, and a rotational location 415 of about 80 degrees about the anterior-posterior axis 418 and relative to the proximal-distal datum plane 435 b. The spray device 430 d has a rotational location 413 of about 23 degrees about the proximal-distal axis 417 and relative to the anterior-posterior datum plane 431, and a rotational location 415 of about −52 degrees about the anterior-posterior axis 418 and relative to the proximal-distal datum plane 435 b. The spray device 430 has a rotational location 413 of about 19 degrees about the proximal-distal axis 417 and relative to the anterior-posterior datum plane 431, and a rotational location 415 of about 49 degrees about the anterior-posterior axis 418 and relative to the proximal-distal datum plane 435 b.

The span between the upper devices 410 a-c/430 a-c and the lower devices 410 d-e/430 d-e ranges between about 11 and 14 inches, thereby limiting the transient of the ozonated water 52 from the spray devices to the hands 20 to between less than 5.5 inches and less than 7 inches. This geometry for the spray devices 401 a-e/430 a-e has been discovered to enable a wide range of hand sizes and minimizing the distance between upper and lower spray devices increases efficiency by minimizing the loss for the ozonated water of dissolved ozone to gaseous ozone and reduces the exposure to gaseous ozone.

Sanitizing System Control

Referring to FIGS. 4 and 17, the control system 500 includes a power supply 510, a controller 512, ozone controllers 540, and a user interface 584. The control system 500 controls all aspects of the operation of and user interaction with aspects of the hand sanitizer 300, particularly the aqueous ozone generators 100 a-b and the spray system 400, including the delivery of untreated water supply 500 to the ozone generators by the pump 622, valves 610, and sensors 616, 620, 624, and 626, and including the delivery of and desired ozone concentration level of the ozonated water 52 to the spray chamber 310. The controller 512 may also provide user guidance and or sensing, for example, in a sanitizing process 700 illustrated in FIG. 18 and described below, controller 512 verifies that a user's hands 20 are positioned within the spray zones 420 and 440 for the duration of a sanitizing cycle. Components of the control system 500 may reside within the hand sanitizer 300, the aqueous ozone generators 100 a-b, or distributed between the hand sanitizer 300 and the aqueous ozone generators 100 a-b.

The control system 500 may optionally implement identity, data logging, fault detection, and other local and/or cloud-based supervisory and operational control functions to ensure proper operation of the hand sanitizer 300, including the ozone generators 100 and user compliance with the hand sanitizing 300 operating requirements and/or external compliance requirements.

The controller 512 in the illustrative embodiment may be a digital control system using a processor 516 and memory 518 and may also include analog circuits, for example power regulator 514 and various actuator and sensor controls. The controller 512 can be powered by the power supply 510, for example a medical grade 500 W AC to DC power supply. The controller 512 may also include a power regulator 514 to further condition and regulate power received from the power supply 510 as required for components of the control system 500 and the water supply system 600, including the controller 512 and the ozone generator controllers 540.

For controlling the untreated water supply 50, the controller 512 can includes a pump control circuit 524 for controlling the operation of the pump 622, and may provide variable control, for example of flow rate and/or pressure of the untreated water supply 50. If the water supply system 600 includes controllable valves such as supply valve 610 and drain valve 618, the controller 512 also can include a valve control circuit 526 for controlling the operation of the valves. For example, in the illustrative embodiment of the spray system 400, each spray device 410 a-e and 430 a-e requires aqueous ozone delivered at at least 4 psi for proper operation, which can be monitored by measure water pressure or flow rate for a given embodiment of the system 300.

The water supply system 600 may also include various sensors, for example, a water level sensor 616 to measure the volume of untreated water held within the holding tank 614, a water temperature sensor 620, a flow meter 624, and a pressure sensor 626. If the water supply system 600 includes any of these optional sensors, the controller 512 may include a sensor control circuit 528, for example, that provides conditioned signals for the sensors and receives data signals indicative of measurements made by the sensors.

The pump control 524, valve control 526, and sensor control 528 may be in data communication with the processor 516, for example, using an onboard communication circuit 522. In one embodiment, the processor 516 may include aspects of the control circuits 524, 526, and 528, for example, as is common in microcontrollers.

The ozone generator controllers 540 a-b may be integral with the controller 512, comprise one or more daughter boards, or comprise a separate board located with the hand sanitizer 300 or the housing 102 of the aqueous ozone generator 100. The illustrative embodiment the hand sanitizer 300 includes an ozone generator controller 540 a for the right aqueous ozone generator 100 a and an ozone generator controller 540 b for the left aqueous ozone generator 100 b. Each ozone generator controller 540 a-b may include, for example, a driver 542 for powering the ozone generating cells 210 a-d, for example a constant current driver such as a buck-boost constant current switching regulator, a power monitor 544, a polarity swap circuit 546, and a sensor circuit 548.

In the illustrative embodiment the ozone generator cells 210 of the aqueous ozone generators 100 are electrolytic, and the polarity swap circuits 546 enable periodic changing of the polarity delivered to the electrodes of the cells, for example swapping polarity between each hand sanitation cycle. The level of ozone generated by the ozone generator cells 210 is a function of power supplied, therefore the power monitor 544 facilitates additional ozone concentration control. Additionally, degradation of the ozone generating cells 210 because of usage or fault may be determined in part by an increase in voltage for given current level, thereby the power monitor 544 being used for detecting degradation or failure of one or more ozone generating cells 210 when an increased voltage is detected beyond a reasonable range for a given current level. In the illustrative embodiment, the ozone generator cells 210 can be driven by a range of at least 0-1.2 amps each, and with four ozone generator cells 210 each driven by a constant current of 410 milliamps, each aqueous ozone generator 100 produces a concentration of 0.8 ppm of aqueous ozone, with an observed typical voltage of 9-12 volts indicating normal ozone generator cell 210 operation. An elevated observed voltage, for example, 20-25 volts, or above 22 volts indicated degraded generator cell 210 operation. In detecting a degrading or degraded cell 210 in this way, operation of ozone generator 100 and system 300 may optionally continue by removing a degrading or degraded cell form operation and using only the non-faulted cells. Additionally, and optionally, controller 512 may store and/or communicate an alert message, for example, to a remote server 80, that an impending change of ozone generator 100 will be required.

The sensor circuits 548 each provide power to and receive data signals from one of the inlet sensor 230 and outlet sensors 240 a-b of the aqueous ozone generators 100. For example, an oxidation-reduction potential sensor or other type sensor is used for inlet and outlet sensors 230 and 240 a-b to measure ozone concentration, providing controller 512 with closed loop control of the production provided by aqueous ozone generators 100. For example, the data signal from at least one ozone inlet sensor 230 can be compared by the ozone controller 540 or the controller 512 to the data signal from at least one outlet sensor 240 a-b to determine the ozone concentration provided by the aqueous ozone generators 100.

In one embodiment, a second inlet outlet sensor 240 b is provided to validate the data signals received in determining the ozone concentration. Additionally, measurement of the ozone concentration in the ozonated water 52 may allow the controller 512 to detect a degradation or failure of one or more aqueous ozone generating cells 210 a-d in the event the supplied power provided by the aqueous ozone controllers 540 a-b does not provide a measured ozone concentration as expected. For example, a testing state of the hand sanitizer 300 may provide individual powering of each ozone generating cell 200 a-d for each aqueous ozone generator 100 a-b in order to detect a degraded or failed cell, and may enable continued use of the aqueous ozone generator 100 a-b, for example, by powering and relying on the remaining fully functioning cells to provide the desired level of ozone concentration.

The generator controllers 540 a-b may include an individual driver 542, power monitor 544, and polarity swap circuit 546 for each of the ozone generator cells 210 a-d. For example, in the illustrative embodiment, the aqueous ozone generator 100 includes up to four ozone generating cells 210 a-d, therefore for separately controllable drivers 542, power monitors 544, and validity swap circuits 546 are included with each ozone controller 540. Other embodiments may include additional or fewer ozone generating cells 210 a-d per generator 100.

In the illustrative embodiment of ozone generator 100 a-b, as will be discussed further below, the ozone generator cells 210 a-d are each exposed to a separate waterflow pathway and the separate pathways are fluidly arranged in parallel. It is thought that the duty life of the ozone generating cells 210 a-d, and thus the generator 100 a-b, can be lengthen in this parallel arrangement as each may be simultaneously operated by the ozone controller 540 a-b at a lower power level to achieve a desired ozone concentration than if fewer cells were used, or if the cells were arranged serially. Additionally, if the desired ozone concentration can be achieved by powering a subset of the ozone generating cells, the duty life may also be lengthened by the ozone controller 540 alternating selectively powering only a subset of the cells. The later may also be used to keep a generator 100 in service that has suffer a degradation or failure of one of the ozone generating cells 210 a-d as the load can be picked up by the remaining fully functional cells without changes to the hardware or water passageway 290.

In the illustrative embodiment of the hand sanitizer 300, a user interface 584 is operated by the controller 512 in coordination with the presence sensor 582 and the hand sensors 592 to coordinate the control of the hand sanitizer 300 with the user, particularly the position and orientation of the user's hands 20 within the spray chamber 310. The presence sensor 582 may be, for example, a capacitive, time-of-flight, or other distance, occupancy, or proximity detection sensor. The presence sensor 582 can be used to detect that a user has approached the hand sanitizer 300 for use. For example, in one embodiment, the controller 512 and presence sensor 582 can be used to wake the hand sanitizer from a standby or low-power state and transition to a ready state, including providing guidance and/or status information to a user via the user interface 584 and/or other indicating device.

In the illustrative embodiment, the controller 512 will not transition from the ready state to irrigation state unless both a hand sensor 592 detects a user's hand in position with the spray chamber 310 and the presence sensor 582 detects a person within sufficient proximity of the spray chamber 310 to use the sanitizer, for example within 18 inches, within 12 inches, or between 6 and 12 inches. Requiring detection by both a hand sensor 592 and the presence sensor 582 eliminates false detections to due water splash residue that could occur if initiation of the irrigation state required only detection by the hand sensor 592.

For example, as illustrated in FIG. 2, the user interface 584 indicates states of the hand sanitizing process. The user interface 584 can be a fixed graphic display that is not lighted or animated, maybe lighting 586, for example with varying colors and steady and flashing states, maybe a dynamic graphic display, for example, including fixed icons with selective backlighting, color, brightness, steady, or flashing illumination of the fixed icons, and/or a display that is not fixed, for example an LCD or other display unit. For example, as illustrated in FIG. 18, operating steps or states of a hand sanitizing process, are indicated. For example, a first state icon instructs insertion of a user's hands 20 upon detection of the presence of the user by presence sensor 582. The hand sensors 590, for example located at an interior chamber top 314 of the sanitizing chamber 310, may be used to detect the movement into and/or position and orientation within the spray zones 420 and 440 discussed above in describing the spray system 400.

Illustrative hand sensors 590 are capacitive, electro-optical, time-of-flight and other sensors known in the art that are capable of detecting presence, location, and/or motion, and that may provide image data from which detection can be determined. For example, in the illustrative embodiment, a hand sensor 590 is located above each of the proper positions for the left and the right hands, for example, above left spray zone 420 and above right spray zone 440, and calibrated to detect when the left and right hands are located within a proper position laterally and vertically, for example, within the left and the right spray zones. The illustrative hand sensor is a time-of-flight sensor, for example a laser-ranging sensor module such as VL53LOX available from STMicroelectronics of Edina, Minn. The identity sensor 580 may include one or more RF antennas capable of detecting an identification or access card at sufficient range so that a user need not specifically swipe an RFID or other identity card while using system 300.

In an alternative embodiment, the hand sensors 590 include a linear infrared array capable of detecting motion and providing a primitive image that can be processed to determine motion, position, orientation, and even finger and thumb spread. For example, the hand sensors 590 may be sensors such as those used for hand gesture detection, for example, sensors available from Neonode Technologies AB, of Stockholm, Sweden.

Upon the controller 512 and hand sensors 590 determining correct position and/or orientation of the hands 20, a second icon state of user interface 584 may be displayed, indicating activation of the spray system 400. For example, irrigation of the hands 20 with ozonated water 52 for a preset duration of time, water volume, or total ozone exposure. Advantageously, if the hand sensors 590 detect improper position or orientation of the hands 20 during the sanitizing state, the user interface 584 can provide an indication to the user to take corrective action. The indication may be a change in the state icon, display of a different icon, or an audible or other indication. Upon successful completion of the sanitizing state, the user interface 584 can display a third completion state, indicating the user that the hand sanitizing cycle has been successfully completed and hands 20 can be removed from the sanitizing chamber 310.

In one embodiment, a visible light indication separate from the user interface 584 may be used with one or more states to indicate a status or instruction to the user. For example, one or more lights turned on, off, flashed, or changed in color or brightness, for example within the sanitizing chamber 310, may indicate a ready state awaiting the insertion of the hands 20, a state indicating the hands 20 are in the proper position and orientation, or completion of the hand sanitizing state.

The indication of a successful completion of a hand sanitizing cycle may also include consideration of other aspects of the hand sanitizer 300 in addition to the position orientation of the hands, for example measurement by the control system 500 of the desired ozone concentration, flow rate, and/or duration.

In on embodiment, the control system 500 includes an gaseous ozone sensor 562 to detect a level of gaseous ozone concentration exhausted through the fan screen 346, for example, to ensure proper functioning of an ozone filter 348 and fan 560 and capturing or neutralizing gaseous ozone drawn from the spray chamber 310. For example, detection of an excessive gaseous ozone level by the controller 512 and gaseous ozone sensor 562 could lockout operation of the spray system 400, including aqueous ozone generators 100 a-b until a control system 500 flag indicating maintenance is required is reset by authorized personnel.

In at least one embodiment, the control system 500 provides a security feature which prevents operation of the spray system 400 if one of the aqueous ozone generators 100 a-b is not detected, is not properly authenticated, or has not been paired for use with the hand sanitizing system 300. For example, the aqueous ozone generators 100 a-b may include a memory device 254 and/or a digital security device 256 that the controller 512 can communication with. A startup or other check of the hand sanitizing system 300 can include an onboard or offboard, for example, via WAN 70 and remote server 80, security check to verify that the aqueous ozone generators 100 a-b are authentic, properly paired for use with the hand sanitizing system 300, and can therefore be relied upon to provide a desired level of ozone concentration or to detect an improper level of ozone concentration. Such a security feature can use part serial numbers, encryption, block-chain technology, or other technology known in the art and incorporated into one or both of the aqueous ozone generators 100 a-b and the control system 500 to ensure operation of the hand sanitizing system 300 is prevented if critical components are not found and validated.

Referring to FIG. 19, a display plan view of various additional or alternative display icon designs for user interface 584 is shown. For example, a number of alternative status indicators for various states and conditions of the hand sanitizer 300 and user's hands 20 are illustrated, including indications of the position and orientation of hands 20, sanitizing cycle time elapsed or remaining, successful and unsuccessful cycle completion, and a user identity (not shown).

Referring to FIG. 4, the control system 500 may also include a personnel identity sensor 580, including, for example, a sensor capable of reading an optical barcode, RF, NFC, or other identification badge or access card, or an imaging device capable of using facial recognition or other biometric identity indicators. The identity sensor 580 may include one or more RF antennas capable of detecting an identification or access card at sufficient range so that the user's ID on their body can be captured passively upon use of the sanitizer 300 without the user having to actively swipe the ID near the identity sensor.

The advantage of incorporating user identity into the control system 500 is to limit access to and/or track the use and compliance regarding the use of the hand sanitizer 300. For example, the processor 512 may be capable of storing in memory 518 or transmitting via the WAN/LAN communication circuit 520 various data logging information that relates to any of system performance, system use, and successful or unsuccessful completion of the sanitizing cycle, including user identity, times, frequency, and outcome of the uses.

Advantageously, in at least one embodiment, a local area network or wide area network 70 may be used to communicate data logging and other data associated with the controller 512 with a personal computing device 82, for example a handheld smart device, or a server or other remotely located computing device 80.

Note that FIG. 17 includes elements of the control system 500 and water delivery system 600 that are optional and may not be included in various embodiments of an aqueous ozone sanitizing system according to the present disclosure. Optional elements include but are not limited to: WAN/LAN transceiver 520, valve controller 526, sensor controller 528, gaseous ozone sensor 562, ID reader 580, presence sensor 582, user interface 584, lighting 586, UV light 588, hand sensors 590, supply valve 510, inlet filter 612, holding tank 614, water level sensor 616, drain valve 618, temperature sensor 620, flow meter 624, pressure sensor 626, and releasable coupling 628.

Of note, the temperature of water for most water supplies does not appear to have significant bearing on either the amount of ozone produced, or the amount of decay in the brief distances and time between generation and application in the illustrative embodiments, so it is contemplated that water temperature measurement or control is not required for many of the applications and uses discussed herein.

Referring to FIG. 18, a hand sanitizing process 700 is illustrated that may be executed by the control system 500, for example the controller 512, for example, including the processor 516. The process begins at step 702. At step 704, the controller 512 may enter a startup state, for example, upon powering on of the system 500, or alternatively in another embodiment, upon the presence sensor 582 and/or identity sensor 580 detecting close proximity of a user. At step 704, the processor 512 may power additional portions of the control system 500, for example, the user interface 584, the pump 622 for priming, and possible direct diagnostic or other system checks of the electrical system 500 and water supply system 600.

Upon the controller 512 determining that the startup state is complete, a step 706 provides a ready state. The ready state of controller 512 may include, for example, an indication on the user interface 584 to the user to insert the hands 20 into the sanitizing chamber 310, for example, indicator lighting 586 illuminating the sanitizing chamber 310 with a steady white light.

In step 708, controller 512 determines using presence sensor 582 whether a user is in close proximity of the front cover 370, for example, in proximity to insert hands into the chamber 310, for example, within 18 inches, within 12 inches, or between 6-12 inches. If not, the process 700 continues at step 706. The controller 512 may also capture user identity information using identity reader 580 for later reporting of system 300 use by the user, for example, at steps 716-724.

At step 710, upon the controller 512 detecting movement within the sanitizing chamber 310, for example, positioning of a hand with the left and/or right spray zones 420 and 440 detected by the hand sensors 590, the process will continue to step 712, else return to step 708. In a step 710, which provides a hand insertion state, user interface 584 feedback or other guidance to the user may be provided regarding hand position and orientation, including based on detection by the hand sensors 590 whether hand position and/or orientation is correct or incorrect. Upon the controller 512 determining correct hand position and orientation, or after expiration of a delay timer, the process 700 continues to step 710.

At step 710, a dispensing/sanitizing state is provided by the controller 512. For example, ozone off-gas mitigation is initiated, including for example powering fan 560, the pump 622 is activated to provide untreated water supply 52 to the aqueous ozone generators 100, and the ozone generator controllers 540 are provided power and control sensing for the ozone generator cells 210 a-d. The ozone generators 100 thereby provide ozonated water 52 to the spray system 400, and spray devices 410 and 430 irrigate the hands 20. The sanitizing state at step 712 may provide an indication of elapsed time, remaining time, and/or an indication of hand position and orientation. Additionally, indicator lighting 586 can illuminate the chamber 310 with a steady teal or aqua light during dispensing. At Step 714, optionally an elapsed time may be paused and optionally ozonated water 52 flow may be stopped in the event the controller 512 and hand sensors 590 detect movement and/or improper position and orientation of the hands 20 relative to the spray zones 420 and 440. Additionally, or alternatively, after detection of correction or after a preset delay, the duration count timer may continue, including completion of the sanitizing state at step 718 once the selected duration of time is completed, for example, 7 seconds. Or alternatively, upon detection of movement and/or improper position, or a fault of the system 300, the controller 512 may proceed to step 716 providing an alert state to the user and/or the remote server 80 that the sanitizing process 700 is incomplete, including for example, indicator lighting 586 illuminating the chamber 310 with a flashing amber light.

Upon successful completion of the sanitizing state for the selected duration of time, at step 720 a dispense/sanitization completion state of the controller 512 removes power from the aqueous ozone generators 100 and the pump 522. Step 720 may optionally provide an indication that the sanitizing state is complete and/or that hands 20 may be removed from the sanitizing chamber 310, for example, the user interface 584 may indicate successful completion, for example, indicator lighting 586 turning off the illumination within the chamber 310, indicating to the user their hands may be shaken to remove water and withdrawn from the openings 372 a and 372 b, and the controller 512 may optionally provide a 3 second delay before changing the indicator lighting 586 to a ready state in accordance with step 706. At step 720, ozone off-gas mitigation continues for a present period of time, for example, 18 seconds, and/or until controller 512 receives a signal from gaseous ozone sensor 562 that mitigation is complete. Optionally, process 706 can continue to step 724 while the controller 512 monitors ozone off-gas mitigation complete as a new cycle could be started at step 706 before completion of mitigation.

The sanitizing control process 700 may also include other steps, for example step 724 may provide a message mode state of the controller 512 that indicates information relating to a maintenance, troubleshooting, fault, or other state or data indicating that execution of step 702 through 710 is inhibited, including via user interface 584, and/or via WAN/LAN transceiver 520, including to remote server 80 or personal computer device 82. After completion of step 724, the process 700 continues at step 706.

Each of the steps 702-724 illustrated in FIG. 18 also list other additional or alternative substrates and/or indications provided by the user interface 584 or other portion of the control system 500.

Aqueous Ozone Generator Cartridges

Referring to FIGS. 15 and 16, an illustrative aqueous ozone generator 100 used with a aqueous sanitizing system according to the present disclosure, including with the hand sanitizer 300, is illustrated. Referring to FIGS. 13 and 14, the aqueous ozone generator 100 includes features described below that enable it to be plugged into the docking receptacle 350, also referred to a docking station, of the hand sanitizer 300 in a single movement along a single axis. For example, not requiring rotation or twisting of the aqueous ozone generator 100 or other components to fluidly and electrically engage and mechanically lock the aqueous ozone generator 350 with the docking receptacle 350. While some prior art designs disclose individual generator cells and individual sensors capable of being unscrewed and replaced from a prior art system, aqueous ozone generator 100 advantageously can provide one or more generator cells 210, sensors, and other electronic and mechanical devices discussed below in a single housing 102 and pluggable, docking form that can be removed and replaced with exposing sensitive surfaces of the components to potential damage upon removal or installation as in prior art systems.

Referring to FIGS. 15 and 16, the aqueous ozone generator 100 receives untreated water supply 50 at a water inlet connector 120 and provides ozonated water 52 at a water outlet connector 130. An electrical connector 250 connects power signals 260, sensor data signals 262, security data signals 264, and data logging signals 266, as will be described further below, with the hand sanitizer 300. The connectors 120, 130, and 250 may be, for example, plastic and/or metal quick-disconnect connectors to facilitate the pluggable aspect of the generator 100, including auto-locking of mechanical features to retain the engaged position. The hand sanitizer 300 include associated connectors 352, 354, and 356 within the docking receptacles 350.

Referring to FIG. 15, the generator 100 is shown in exploded perspective view. Referring to FIG. 16, a manifold 140 of generator 100 is shown in an assembled cross-sectional view. The manifold 140 that forms a water passageway 290 for waterflow and treatment between an inlet opening 192, at which the connector 120 may be attached, and an outlet opening 202, at which the connector 130 may be attached. The manifold 140 also mounts and fluidly couples with the water passageway 290 several water treatment devices 110, 230, and 240.

In the illustrative embodiment the manifold 140 and the water passageway 290 include a central water passageway portion 150 that is fluidly coupled between an inlet waterway passage portion 190 and an outlet water passageway portion 200. In the illustrative embodiment of the generator 100, ozone generating cells 210 a-210 d are mounted upon and fluidly coupled with the central water passageway portion 150, an inlet sensor 230 is mounted upon and fluidly couples with inlet water passageway portion 190, and outlet sensors 240 a and 240 b are mounted upon and fluidly coupled with the outlet water passageways portion 200.

In the illustrative embodiment, an untreated supply waterflow 23 provided to the generator 100 by water supply connector 352 flows through an operably fixed (i.e., continuous, without valves or other actuators that operably change the flow) water passageway 290 formed by manifold 140, ultimately exiting as ozonated water 52 at an outlet opening 202 of the outlet water passageway portion 200 and supplied to the ozonated water connector 354. As will be further discussed below, the operably fixed water passageway 290 includes a parallel flow water passageways 292 a-d that are enabled in part by a coaxial feature of the central water passageway portion 150.

An electrical connector 250 that is coupled with electrical connector 356 is accessible from outside of the housing 102 and can be electrically coupled to or mounted to a circuit board 252. The circuit board 252 may include, for example, a memory device 254 and related electrical components, and a security device 256, which may be separate from or a function of the memory device 254. In the illustrative embodiment, controller 512, including generator circuits 540, send/receives power signals 260 and sensor data signals 262 with the generator 100; however, in an alternative embodiment, circuit board 252 may comprise these elements.

An inlet sensor 230 sensor provides measurement of an attribute, e.g. a property or parameter, of the untreated supply waterflow 23 that will be altered by the ozone generating cells 210 effecting an increase in ozone concentration in the waterflow through the water passageway 290. For example, inlet sensor 230 may be an oxidation reduction potential (ORP) sensor that provides a baseline measurement to controller 512 that can be compared to a measurement of the same property/parameter provided of the ozonated water 52 flow out of water passageway portion 150 of the manifold 140.

A change in oxidation-reduction potential (ORP) can be attributed to an increase in the ozone concentration in the water. An ozone concentration level can be determined by measuring the ORP downstream of the ozone generating cells 210 a-d, and taking into account the ORP of the untreated water supply if known and consistent, or by actually measuring and taking into account the ORP upstream of the ozone generating cells 210 a-d. The ozone concentration added to the water by the ozone generating cells 210 a-d can be calculated as a function of the differential in upstream and downstream ORP measurements.

The inlet sensor 230 can comprise at least a pair of electrodes, a working electrode and a reference electrode, or alternatively, a set of three electrodes, a counter electrode, a working electrode, and a reference electrode, carried by one or more non-conductive substrates, such as silicone or glass, supported by a housing and exposed to the waterflow. The reference electrode uses an inert metal, for example, gold, platinum, silver or a chloride molecule thereof, which resist chemical action and corrosion, but will lose electrons to an oxidant such as ozone until its potential reaches that of the ORP level of the water. By comparing a constant potential established between the working electrode and counter electrode pair, which is not affected by change in ORP, with the potential of the reference electrode, which is, the ORP of the water is determined. The conversion from difference in potential to the concentration of ozone can be made based on a calibration factor or look up table for the electrode set developed using a solution of known ozone concentration.

The sensor 230 and sensor 240 a-b discussed below may be, for example, one of the sensor configurations disclosed by US Patent Publication 2016/0209346 published Jul. 21, 2016, which is hereby incorporated herein by reference, or the commercially available electrode sensor part numbers such as RRPX020AU and RREFX103 or RRPE100XC and RRPEAGCL from Pine Research of Durham, N.C.

In some embodiments, sensors 230 and 240 a-b may additionally or alternative include sensing elements on a single or multiple substrates for temperature, flow, conductivity, acidity, and other such attributes of water.

Referring to FIG. 16, a flow separation chamber 142 is defined by the central water passageway portion 150. In the illustrative embodiment, the waterway passageway portion 150 includes an internal conduit 180 located coaxially within outer conduit 160, thereby defining a coaxial arrangement and parallel flow feature of manifold 140. The functions of the central water passageway portion 150 include exposing the waterflow through water passageway 290 to the ozone generating cells 210 a-d, thereby increasing the ozone concentration of the waterflow, and minimizing the length of water passageway 290 and minimizing changes in water pressure, velocity, vortices, and other flow disturbances, all of which all to the reduce ozone concentration of the waterflow.

Each ozone generating cell 210 a-d includes a generating portion 212 a-d as well as a housing, fluid pathways, and/or other support structure. An exemplary generating portion 212 a-d includes a pair of electrode plates (an anode and a cathode) having slots defined therethrough for the flow of water, hydrogen, oxygen, and ozone. The electrodes can be constructed of boron-doped silicone and coated with boron-doped diamond, for example, using chemical vapor deposition. Power can be applied from all edges of the electrodes to maximize ozone production. The electrodes can be separated by a thin membrane that allows proton exchange therethrough, and for example a solid polymer electrolyte such as a polytetrafluoroethylene (PTFE)/perfluorosulfonic acid (PFSA) copolymer membrane, which is commercially available from The Chemours Company of Wilmington, Del. as NAFION (trademark of The Chemours Company FC, LLC).

As is discussed further below, each of the parallel water passageways 292 a-d of the present disclosure can provide a waterflow across each oppositely charged electrode plate, for example, across the electrode surface on the side opposite the separation membrane, resulting in the production of ozone within the water. The thin separation membrane located between electrode plates, for example, 20-30 microns thick, may also allow for some cross-diffusion of water, hydrogen, and oxygen molecules.

The concentration of ozone developed by the generating cell is a function of the level of power supplied to the electrolytic generating cell by generator circuits 540. In particular, by controller 512 controlling the current supplied to each ozone generating cell, the concentration of ozone can by controlled. In the illustrative embodiment, the concentration of ozone controlled by hand sanitizer 300 via the individual power signals 260 provided by generator circuits 540, through connectors 356 and 250 and connected through to each respective ozone generating cell 210 a-d.

An example of an ozone generating cell 210 suitable for use in generator 100 for generating aqueous ozone is an electrolytic cell, for example, as disclosed by U.S. Pat. No. 10,640,878 issued on May 5, 2020, which is hereby incorporated herein by reference; however, alternative or improved ozone generating cells known in the art are also contemplated for use in generator 100. Exemplary electrolytic ozone generating cells 210 provide a mechanical structure to guide a water flow across the surfaces of a perforated pair of electrodes, an anode and a cathode each framed by a current spreader, and separated by a proton exchange membrane (PEM) designed to conduct protons between the anode and cathode. An exemplary electrode can be constructed of boron-doped silicon or another suitable material. The boron doped silicon material serves as a conductor to pass current between the current spreader and boron doped, The doped silicon material may be about 200-800 microns thick, such as about 500 microns thick. The front side each electrode may have a boron-doped diamond coating or another suitable coating. The coating may be about 2-10 microns thick. The coating may be applied to the underlying silicon material by chemical vapor deposition (CVD) or another suitable deposition technique. The illustrative electrodes can be rectangular in shape, for example, having a width of about 8 millimeters and a length of about 10 millimeters, although the size and shape of the electrodes may vary, and are available from Neocoat SA of La Chaux-de-Fonds, Switzerland.

The PEM may be constructed of a solid polymer electrolyte (SPE) membrane, for example, polytetrafluoroethylene (PTFE)/perfluorosulfonic acid (PFSA) copolymer membrane, which is commercially available from DuPont™ as a Nafion® membrane.

The arrangement of the various components of central water passageway portion 150 and ozone generating cells 210 a-d divides the waterflow through the water passageway 290 into a number of water passageways 292 a-d that is that same as the number ozone generating cells 210 installed with manifold 140. Each of the parallel water passageways 292 a-d enter the inner conduit 180 through the respective cell opening 182 defined by the inner conduit.

Another function of the parallel water passageways 292 a-d arrangement is that a higher ozone concentration can be achieve for the same flowrate through the water passageway 290 and power delivered to the ozone generating cells 210 a-d than can be achieved for the same number of ozone generating cells 210 a-d arranged in a serial water pathway arrangement. In the parallel arrangement, the water flowrate through each ozone generating cell 210 a-d is divided by the number of cells/parallel water passageways 292 a-d, for example, four for the illustrative embodiment. This provides the waterflow through each parallel water passageway with a higher ozone concentration than if the flowrate was four times as high. Although a serial arrangement should boost the ozone concentration at each successive ozone generating cells 210 a-d, it has been found that the loss of ozone generated by early cells and flow through subsequent cells, for example, due to the waterflow experiencing added disturbances to the flow by the serial flow arrangement, reduces the efficacy of the cumulative serial effect in boost ozone concentration.

It is also thought that the parallel water passageways 292 a-d arrangement can lengthen the duty life of the ozone generating cells 210 a-d as each may be operated at a lower power to achieve the desired ozone concentration than if fewer cells were used, or if the cells were arranged serially. And if the desired ozone concentration can be achieved by powering a subset of the ozone generating cells, the duty life can be lengthened by alternating selectively powering only a subset of the cells. The later may also be used to keep a generator 100 in service that has suffer a degradation of failure of one of the ozone generating cells 210 a-d as the load can be picked up by the remaining fully functional cells without changes to the hardware or water passageway 290.

In the illustrative embodiment of manifold 140, a flow confluence chamber 144 is defined adjacent a second end 187 of the inner conduit 180 and the inlet opening 206 of the outlet water passageway portion 200. Within the flow confluence chamber 144, the waterflows from the first and second flow chambers 188 a-b, (separate parallel water passageway flows 292 a-d) are recombined again into a single waterflow through water passageway 290 in the outlet water passageway portion 200.

The ozonate water 52 through the outlet water passageways portion 200 passes over the surfaces of sensors 240 a-b, for example oxidation reduction potential sensors as is disclosed above. By comparing ORP of ozonated water 52 as measured by sensors 240 a and 240 b, with the untreated supply waterflow 23 as measured by sensor 230, the ozone concentration added to the water passageway 290 waterflow by the ozone generating cells 210 can be determined and ozone generating cells 210 can be individually and collectively controlled by controller 512 accordingly via power signals 260 provided by generator circuits 540 to achieve a desired ozone concentration. Alternatively, the inlet sensor 230 could be eliminated and untreated supply waterflow 23 by sensor 240 a with waterflow provided without energizing ozone generator cells 210 to baseline ORP for later comparison with ORP of ozonated water 52 measured by sensor 240 a when the ozone generator cells 210 are energized. Yet another alternative is to for gall all ORP sensors 230 and 240 a/b and to control the desired aqueous ozone concentration by setting the current level know to produce the specific concentration desired for the configuration of the generator 100 for a given flow rate, for example, 410 milliamps, for 3 gph, to provide 0.8 ppm aqueous ozone for the illustrative embodiment.

With brief reference to FIGS. 1A and 4, the inlet water passageway portion 190 defines a connector mount 194 for coupling the inlet connector 120 to the manifold 140. For example, the connector mount 194 may be a threaded coupling, compression coupling, adhesive joint, or other known standard or non-standard fluid coupling known in the art and suitable for the selected type of the water inlet connector 120. The outlet water passageway portion 200 defines a corresponding connector mount 204 at outlet opening 202 for the water outlet connector 130.

An advantage of the generator 100 according to the present disclosure is how compactly ozone generating cells 210 and sensors 230 and 240 can be housed and coupled with the water passageway 290 for ozonating the waterflow. For example, by minimizing the length of the water passageway 290, losses in ozone concentration is minimized. One aspect of minimizing the length of the water passageway 290 is the coaxial arrangement of the central water passageway portion 150, including the parallel water passageways 292 a-d arrangement that the coaxial arrangement enables. Another aspect of minimizing the length is locating more than one ozone generating cell 210 along the same circumferential arc 158 (defined by axes 156 a-b), as illustrated in FIG. 7 and FIG. 8C. For example, cell mount coupling 170 a is located at an angular axis 156 a of +90 degrees along the circumferential arc 158, and cell mount coupling 170 b is located at an angular axis 156 b of −90 degrees along the circumferential arc 158.

The various components of the manifold 140 may be constructed, for example molded from rigid materials not susceptible to breakdown from water and ozone, for example, polysulfone (PSU), polyvinylidene fluoride (PVDF), or 40% glass fiber reinforced polyphenylene sulphide (PPS). In other embodiments, the manifold 140 may be comprised of a unitary structure or a structure divided into portions or subcomponents differently than is described herein for the illustrative embodiment and as may be desirable for manufacturing, assembly, operational or reconstruction.

The electrical connector 250 can be electrically coupled to or mounted directly to a circuit board 252. The circuit board 252 may include a memory device, for example for identification data for the generator 100 and/or the associated hand sanitizer 300, or both, including for example a serial and/or model number and/or compatibility information between generators 100 and sanitizers 300, and pairing of a specific serial number generator with a specific serial number sanitizer. Additionally, the memory device 254 may enable data logging of usage, including lifespan, error detection, and information concerning individual instances of use by personnel. Lifespan data may include calibration information, specifications, elapsed or remaining usage of individual ozone generating cells 210 and/or the generator 100, including based on, for example, hours, gallons of water, ozone volume, total power, and the like.

Data logging may include transmission of usage information through electrical connector 250 to controller 512 for storage on memory 518 or for transmission to a personal computing device and/or remote server 80. Additionally, a security device 256 be included as a separate device, or as a feature of the memory device 254. Security device 256 may include encryption, blockchain, or other secure feature to authenticate the source of manufacturing, or reconstruction of the generator 100, or the pairing of generator 100 with a particular hand sanitizer 300 or other connected devices.

The electrical connector 250 and circuit board 252 an receive power signals 260 for driving the ozone generating cells 210 a-d, powering the sensors 230 and 240 a-b, and for sending sensor data signals 262 from the sensors, and for sending and/or receiving security data signals 264 and logging data signals 266. In one embodiment, circuit board 252 includes a processor for providing control, security, data logging, or other functionality recited herein or otherwise known to a person of ordinary skill in the art for manufacturing, operating, repairing, and reconstructing the generator 100.

Referring to FIG. 15, reconstruction of an expended generator cartridge 100 can include, for example, separating housing 102, removing and replacing all degraded components, for example, generator cells 210 and/or sensors 230 and 240, cleaning those and other remaining components that can be reused, replacing remaining components as required, reassembly and closing housing 102, rewriting memory and security devices 252, 254, 256, and calibration and/or testing, for example, verifying that the reconstructed generator 100 provides the desired aqueous ozone 25 concentration for water 23 provided at a given flowrate with the expected current and voltages levels for each of the generator cells 120, including proper operation of any sensors 230 and 240.

Referring to FIGS. 13 and 14, plug-in coupling of the generator 100 into a corresponding docking receptacle 350 of the hand sanitizer 300 requires proper orientation to ensure that the electrical connector 250 and the water inlet connector 120 and water outlet connector 130 are not reversed with the corresponding connectors 352, 354, and 356 of the docking receptacle. One or both of generator 100 and the docking receptacle 350 can include orientation features that prevent coupling if the orientation is incorrect. For example, a guidance and orientation feature 110 d (FIG. 15) at a first end of the housing 102, in this example a recess or a protrusion. Corresponding guidance and orientation features 358 (FIG. 13) of the docketing receptacle 350 are interoperable with orientation feature 110 d or operate in addition to prevent plugging of the generator 100 into the docking receptacle 350 unless oriented and/or positioned correctly to result in proper water and electrical connections.

Alternatively, different size, shape, or other configuration of the water inlet connector 120 and the water outlet connector 130 and their associated connectors 352 and 354 of the docking receptacle 350 can be used to prevent a ensure proper orientation and prevent a reverse connection. Similarly, oriented features of the electrical connectors 250 and 356 could alternative be used to ensure correct orientation. Housing 102 may also define recesses, for example orientation features 110 d (FIG. 15) to additionally or alternative operate with features of the docking station 350 to prevent improper orientation and review connections.

Referring to FIG. 13, to enable plugging and unplugging generator 100 into the docking receptacle 350 using a singular axis motion, the water connectors 120 and 353 are fixed respectively in housing 102 and docking receptacle 350 to define a common longitudinal axis 353 that is displaced laterally and oriented parallel with a common longitudinal axis 355 of the water connectors 130 and 354. A connection axis of the electrical connectors 250 and 356 is also parallel to the longitudinal axes 353 and 355.

Advantageously, each of the three pair of connectors, 120 and 352, 130 and 354, and 250 and 356 are selected to enable pluggable engagement using a singular axis of motion along longitudinal axes 353 and 355 to engage all of the corresponding connectors simultaneously and without further action other than moving the generator manually into position along the referenced parallel axes. For example, the generator can be held and moved into position to connect the three connector pairs without manually manipulating each or any of the connectors 120 and 352, 130 and 354, and 250 and 356.

Additionally, and advantageously, a locking mechanism 116 of the generator 100 can operably cooperate with a locking mechanism 360 of the docking receptacle 350 so that generator 100 auto-locks into position relative to the docking receptacle 350, ensuring corresponding connectors remain engaged. Referring to FIGS. 14A and 14B, a release mechanism 362 a associated with the docking receptacle or a release mechanism 118 associated with the generator 100 can be manually actuated to disengage locking mechanisms 116 and 360. The connector pairs used for 120 and 352 and/or 130 and 354 can be selected to be auto-locking fluid connectors as are known in the art.

For example, the water connector 352 may include locking clips that springs into position to engagingly interfere with an engagement feature 126 of the water inlet connector 120 to fluidly couple the connectors 352 and 120 until manually released by the release mechanism 362 a which can move the locking clips to a disengaged position, allowing the generator 100 to be pulled along axes 353 and 355, disengaging the connector pairs and allowing the generator 100 to be removed from the docking receptacle 350 and be replaced with a new or a reconstructed generator 100. For example, commercially available connectors such as part numbers HFCD261235BSPP and HFCD16835 available from Colder Product Company of Saint Paul, Minn.

Because of the pressure provided by untreated water supplies 50 varies significantly with local utility and building infrastructure, to ensure sufficient pressure and flowrate of untreated water required for correct operation of the hand sanitizer 300, an untreated water holding tank 614 can be included to receive an accumulate water from the untreated water supply for subsequent sanitizing cycles, and the water pump 622 can be provided with the sanitizer to deliver the desired flowrate from the holding tank to the generator 100 of about 3.0 gallons per minute at a supply pressure entering the generator 100 of about 60 psi, a typical pressure available in municipal water supplies. An illustrative holding tank 614 provides capacity for more than one full sanitizing cycle, for example, at least two cycles, for example, at least about 1.8 gallons. An illustrative water pump 622, for example, a self-priming diaphragm pump, provides a capacity of up to 5.5 gallons per minute and maximum pressure of 70 psi. In an alternative embodiment, other compensating flow rate restrictor(s) may be used to provide the desired flow rate and pressure. An example fan 560 provides 155 cubic feet per minute of airflow. An example ozone filter 348 is an activated carbon filter sized about 15.5 cubic inches. Alternative or additional filter material for filter ozone out of the exhaust airflow include catalysts such as manganese dioxide and copper dioxide.

An embodiment of the present disclosure may also include additional and/or alternative features and details as in known in the art for aqueous ozone systems, for example, as disclosed by US Patent Publication No. 2019/0001006 published Jan. 3, 2019, and hereby incorporated by reference herein.

While the invention has been illustrated and described in detail in the foregoing drawings and description, the same is to be considered as illustrative and not restrictive in character, it being understood that only illustrative embodiments thereof have been shown and described and that all changes and modifications that come within the spirit and scope of the invention as defined in the claims and summary are desired to be protected.

REFERENCE NUMERAL LISTING  20a-b user's hands  22 lateral-medial axis  23 lateral-medial rotation  24 anterior-posterior axis  25 anterior-posterior rotation  26 proximal-distal axis  30 wrist  32 central  34 palm side  36 dorsal side  38 fingers  40 thumb/lateral  42 medial (little finger)  44 forearm  50 untreated water supply  52 ozonated water  70 WAN  80 server  82 personal computing device 100a-b aqueous ozone generator 102 housing 104a-b housing side 105a-b component supports 116 locking mechanism 118 release mechanism 120 water inlet connector 122 opening 126 engagement feature 130 water outlet connector 132 opening 136 engagement feature 140 manifold 142 flow separation chamber 144 flow confluence chamber 150 coaxial water passageways portion 152 baffle/divider 170a-d cell mount coupling 172a-d cell coupling opening 176 annulus 180 inner conduit 181 first end 187 second end 188a-b first/second flow chamber 190 inlet water passageways portion 192 inlet opening 194 connector mount 196 outlet opening 197 outlet coupling 198 sensor coupling 200 outlet water passageways portion 202 outlet opening 204 connector mount 206 inlet opening 207 inlet coupling 208a-b sensor couplings 209b sensor alignment feature 210a-d ozone generating cells 212 generating portion 220a-d mount coupling 230 inlet sensor 231 sensor element 232 coupling 240a-b outlet sensors 241a-b sensor elements 242a-b mounting coupling 250 electrical connector 252 circuit board 254 memory device 256 security device 258 connection axis 260 power signal 262 sensor data signal 264 security data signal 266 logging data signal 290 water passageway 292a-d parallel water passageways 300 aqueous ozone hand sanitizer 310 sanitizing chamber/hood 312 chamber upper half 314 chamber top 316 top contours 320 chamber lower half 322 chamber bottom 324 bottom contours 325 drain 326 left side 328 right side 330 housing chassis 332 lower frame 334a lower portion 334b counter top upper portion 336 cover/hood 338 cover frame 340 left cover 342 right cover 344 top cover 346 fan screen 348 ozone filter 350a-b docking receptacle/station 352 water supply outlet connector 353 supply longitudinal axis 354 ozonated water inlet connector 355 ozonated longitudinal axis 356 electrical connector 358 orientation/alignment feature 360 locking mechanism 362 release mechanism 370 front cover 372a-b openings 374 horizontal axis 376 vertical axis 380 center 382 opening vertical span 384 opening horizontal span 386 opening spacing 390 channel 392 channel vertical span 394 rim 396 horizontal marking feature 398 vertical marking feature 400 spray system 402a-b manifold 404a-b pressure sensor 406a-b flow meter 410a-e left spray devices/delivery outlets 411 fluidic oscillator 412 device longitudinal axis 413 rotational displacement angle 414a upper rotational displacement span 414b lower rotational displacement span 415 rotational displacement angle 416a upper rotational displacement span 416b lower rotational displacement span 417 proximal-distal axis 418 anterior-posterior axis 419a-b spray fan angular displacement 420 left spray/application zone 421a-e device spray pattern 424 lateral-medial axis 430a-e right spray devices/delivery outlets 431 anterior-posterior datum plane 432 anterior-posterior location 433a proximal-distal location datum plane 433b proximal-distal angular datum plane 434 proximal-distal location 435a lateral-medial location datum plane 435b laterial-medial angular datum plane 436 laterial-medial location 440 right spray/applicaton zone 441 lateral-medial zone center 442 anterior zone edge 443 zone anterior-posterior span 444 zone anterior-posterior slope 446 proximal zone edge 447 zone lateral-medial span 448 zone lateral-medial slope 449 zone proximal-distal span 500 control system 510 power supply 512 controller 514 power regulator 516 processor 518 memory 520 WAN/LAN transceiver 522 onboard transceiver 524 pump controller 526 valve controller 528 sensor controller 540 generator controllers 542 driver 544 power monitor 546 polarity swap 548 sensor circuit 560 fan 562 gaseous ozone sensor 580 ID reader 582 presence sensor 584 user interface 586 lighting 588 UV light 590 hand sensors 600 water supply system 610 supply valve 612 inlet filter 614 holding tank 616 water level sensor 618 drain valve 620 temperature sensor 622 pump 624 flow meter 626 pressure sensor 628 releasable coupling 700 sanitizing process 

1. A control system for an aqueous ozone sanitizing device for sanitizing a first and a second object, comprising: a power supply; a controller powered by the power supply and for controlling a process of the sanitizing device, including a state of dispensing aqueous ozone to a first application zone; a proximity sensor coupled to the controller and configured to detect the presence of a user within a preset proximate distance to the sanitizing device; and a first object sensor coupled to the controller and configured to detect placement of the first object within the first application zone; and wherein the controller initiates the state of dispensing aqueous ozone to the first application zone only upon both the proximity sensor detecting the presence of a user within the preselected distance to the sanitizing device and the first object sensor detecting placement of the first object within the first application zone.
 2. The control system of claim 1, wherein the proximity sensor is a capacitive sensor configured to detect a user's body within a preselected distance from the sanitizing device that is close enough for the user to position the first object within the first application zone.
 3. The control system of claim 1, wherein the proximity sensor is configured to detect that the user is within about 18 inches of the sanitizing device.
 4. The control system of claim 1, wherein the proximity sensor is configured to detect that the user is within 12 inches of the sanitizing device.
 5. The control system of claim 1, wherein the first object sensor is a time-of-flight sensor configured to detect the first object located within the first application zone.
 6. The control system of claim 1, further comprising an indicator coupled to the controller, the indicator configured to provide to the user an indication of the state of the process.
 7. The control system of claim 6, wherein the indicator includes a plurality of different colored light illuminations, each of the plurality of different colored light illuminations indicating at least one of a plurality of states of the process, the plurality of states of the process including at least a ready state, the state of dispensing aqueous ozone to a first application zone, a state of process error, and a state of mitigating ozone off-gas.
 8. The control system of claim 6, wherein the indicator includes at least one light configured for a steady illumination for at least a first state of the process and a flashing illumination for at least a second state of the process.
 9. The control system of claim 6, wherein the indicator is positioned with the sanitizing device to illuminate at least the first application zone with light.
 10. The control system of claim 1, wherein the process of the sanitizing device further includes a state of mitigating ozone off-gas that the controller activates beginning no later than an initiation of the state of dispensing aqueous ozone to the first application zone and continuing after the termination of the state of dispensing aqueous ozone to the first application zone.
 11. The control system of claim 10, further comprising a gaseous ozone detector coupled to the controller, and wherein the state of mitigating ozone off-gas is terminated by the controller after the gaseous ozone detector measures a level below a preset threshold.
 12. The control system of claim 10, wherein the state of mitigating ozone off-gas is terminated by the controller after a preset time delay following the termination of the state of dispensing aqueous ozone to the first application zone.
 13. The control system of claim 1, further comprising: a second object sensor electrically coupled to the controller and configured to detect placement of the second object within a second application zone of the sanitizing device; and wherein the controller initiates the state of dispensing aqueous ozone to the first application zone only upon all of: the proximity sensor detecting the presence of a user within a preselected proximate distance to the sanitizing device; the first object sensor detecting placement of the first object within the first application zone; and the second object sensor detecting placement of the second object within the second application zone.
 14. The control system of claim 13, wherein the first and second object detectors are configured to detect the user's placement of a left and a right hand within corresponding ones of the first and second application zones.
 15. The control system of claim 13, wherein the first and second object detectors are configured to detect the user's placement and orientation of a left and a right hand within corresponding ones of the first and the second application zones.
 16. The control system of claim 1, wherein the process further includes a state of process error, the process error state initiated by the controller upon detection of the first object displaced from the first application zone before a completion of the state of dispensing aqueous ozone to the first application zone.
 17. The control system of claim 1, further comprising: at least one of a flow rate sensor and a parameter sensor, the parameter correlating to a level of ozone concentration within the aqueous ozone; and wherein the process further includes a state of process error, the process error state initiated by the controller upon detection of at least one of the flow rate sensor detecting a flow rate outside of a pre-selected range and the parameter sensor detecting the parameter outside of a pre-selected range.
 18. A control system for an aqueous ozone sanitizing device for sanitizing an object, comprising: a controller for controlling a process of the sanitizing device, including a plurality of process states; a proximity sensor coupled to the controller and configured to detect the presence of a user within a preset proximate distance to the sanitizing device; an object sensor coupled to the controller and configured to detect placement of the object within an application zone of the sanitizing device; and a user interface coupled to the controller and including an indicator of the plurality of process states; and wherein plurality of process states include at least: a state of dispensing aqueous ozone to the application zone initiated by the controller only upon both the proximity sensor detecting the presence of a user proximate to the system and the object sensor detecting placement of the object within the application zone; a state of completion initiated by the controller upon maintaining the state of dispensing aqueous ozone to the object in the application zone for a preset length of time; and a state of process error initiated by the controller upon not maintaining a state of dispensing aqueous ozone to the object in the application zone for the preset length of time.
 19. A control system for an aqueous ozone sanitizing device for sanitizing a user's body parts, comprising: a controller for controlling a process of the sanitizing device, including a plurality of process states; a plurality of body part sensors coupled to the controller and configured to detect placement of the user's body parts within at least one application zone of the sanitizing device; and a user interface coupled to the controller and including an indicator of the plurality of process states; and wherein plurality of process states of the controller include at least: a ready state; a state of dispensing aqueous ozone to the at least one application zone initiated by the controller upon the plurality of body part sensors detecting placement of the user's body parts within the at least one application zone; a state of completion initiated by the controller upon maintaining the state of dispensing aqueous ozone to the user's body parts within the at least one application zone for at least a preset length of time; a state of process error initiated by the controller upon not maintaining a state of dispensing aqueous ozone to the user's body parts within the at least one application zone for the preset length of time; and a state of mitigating ozone off-gas initiated by the controller to coincide with the initiation of and continuing after termination of the state of dispensing aqueous ozone; and wherein the indicator includes a plurality of different light illuminations, each of the plurality of different light illuminations indicating at least one of the plurality of process states.
 20. The control system of claim 19, wherein the user interface further indicates proper orientation of the user's body parts within the at least one application zone. 